ipactl restart: log httplib failues as debug
    
    There are several excerptions ConnectionRefusedError raised
    before ipactl is able to connect to dogtag after restart. These
    exception should be logged on debug level until timeout is reached.
    
    https://fedorahosted.org/freeipa/ticket/6674
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>